feat: referral set and team creation tests

[cdummett]

... to test core PR vegaprotocol/vega#11604

Following cases tested in market-sim...

1. a party can create a referral set without creating a team
2. a party can create a team without creating a referral set
3. a party can create a referral set and create a team
4. a party who has applied a referral code, but could not join a team
   • cannot create their own referral set
   • can create their own team
5. a party who has applied a referral code, and joined the team
   • cannot create their own referral set
   • can create their own team
6. a party who has applied a referral code, and optionally not joined the team
   • cannot create their own referral set
   • can create their own team